Pumping apparatus for handling gases and liquids



July 31, 1928. 1,678,909

I. 0. JENNINGS PUMPING APPARATUS FOR HANDLING GASES AND LIQUIDS FiledSept. 6, 1927 5 Sheets-Sheet 1 (ecvr 7520a I 1N V/[NTOR I July 31, 1928.1,678,909

I. C. JENNINGS PUMPING APPARATUS FOR HANDLING GASES AND LIQUIDS FiledSept. 6, 1927 3' Sheets-Sheet 2 11v VENTUR C Jew/21x2 July 31, 1928.1,678,909

I. C. JENNINGS PUMPING APPARATUS FOR HANDLING-GASES AND- LIQUIDS FiledSept. 1927 s Sheefi's-Sheet 3 INVENTOR Patented July 31, 1928.

UNITED STATES IRVING C. JINGS, OF SOUTH NORWALK, CONNECTICUT.

PUMPING A'IPT'ARLATUS FOR HANDLING GASES ANDLIQUIDS.

The object of this invention is to provide a very simple pumpingapparatus for handling both'gases and liquids. The apparatus has beenespecially designed for use in vacuum steam heat-ing systems, for use inpaper mill work, and for use in pump work such as removing drainage orsewage.

The invention comprises a simple mod1ficatlon of the well known Nash airor gas pump, which is covered by patents grantedto Lewis H. Nash, No.953,222, dated March 29, 1910 and N 0. 1,091,529, dated March 31, 1914,and which in improved form isshown in patent granted to me No.1,297,692, dated March 18, 1919.

The invention is illustrated in the accompanying three sheets ofdrawings in which Figure 1 is a diagram illustrating the pipingconnections, Figure 2 is a plan of the pump and the motor employed fordriving the same,

Figure 3 is a cross-sectional elevation on an enlarged scale on theline'"3'3 'ofFig'ure 2, illustrating the ports and connections employedfor pumping the liquid,

Figure 4 is a cross-sectional view on the a vacuum steam heating, thereturns, which line 4-4 of Figure 2, illustrating the gas inlet andoutlet ports of thepump, and

Figure 5 is a view similar to Figure 1,

illustrating a modified form of piping.

The Nash pump before referred to comprises a rotorkhaving displacementchambers on its periphery arranged in a casing shapedeccentrically-relatively to the rotor. This casing is rovided withports. The pump is partly lled with a liquid, as water. As the rotor isdriven at high speed, this liquid will assume a ring shape around in--side of the casing and will recede from the chambers by centrifugalaction and will be forced into the chambers by its velocity and thecrowding-in action against the casing, so that in effect the liquid willform water pistons reciprocating into and out of the displacementchambers. A pump of this character is particularly adapted to handle agas, and although it will handle a liquid, it does not do soefficiently. The object of this invention is to re-arrange this pump sothat it will handle both gases and liquids efllciently.

To do this, I provide an outlet or port or outlets or ports in thecasing at the point or points where the liquid is being crowded inwardlyinto the displacement chambers,

and connect the same preferably to an hy- Application filed September a,1927. Serial No. 217,669.

drostatic head, so that when any excess 9 liquid passes to the pump, itwill be pumped out against this hydrostatic head. By this arrangement,the pum can be used to main taln'a vacuum by ex austing air and gas, andalso to pump efiiciently any liquid drawn along with the air or gas; or,in other words, one rotor can be adapted for efficient use in anylocation Where both gases and liquids have to be handled.

Referring to the drawings and in detail, A

designates the pump casing, in whichjs arranged the rotor B providedwith the usual displacement chambers. The casing is arranged with twoeccentric sections, so that two pumplng actions will be obtained in eachdisplacement chamber for each rotation of the rotor. Suitable gas inletports C, C and gas outlet ports.D D areprovided in the side of thecasing to cooperate with the side of the rotor B, as shown in Figures 3and 4. The construction thus far described is a well known form of Nashpump. When this pump is filled with a liquid, the same will act to pumpgas.

If my improved pump is to be used in are to be handled, are lead to thepump through an inlet pipe E, which connects to the inlet ports G C; andthe air or gas, which is to be exhausted, is. forced out through anoutlet pipe F which is connected to the outlet ports D D.

Outlets or ports G G are formed in the pump casing at the points wherethe operating liquid tends to exert its 'maximum compression efiect, orWhere it is forced most completely into the displacement chambers.

Pipes H vH are connected to these outlets orports, and these pipespreferably connect to a single pipe I, Which is carried upwardly for aconsiderable height and then connected to a header J. The pipe I iscarried up high enough so as to give any desired hydrostatic head backinto'the pump casing. The water or liquid handled by the pump anddelivered over into the header J can be taken therefrom through a pipeK. If the apparatus is used in vacuum'steam heating, this pipe K can beconnected to the boiler through 'a suitable check valve, the hydrostatichead serving to force the water into the boiler against the pressure,therein.

In operation, when air or gas only is being handled, the pump will'actas an ordinary Nash pump and will exhaust the air orgas by the pistonaction of the water in the displacement chambers of the rotor and .airor gas, will cause the water to raise'or back up in the pipe I and flowover into the header J. This surplus water thus will be easily andsmoothly handled as it does not have to be. forced into the displacementchambers of the rotor and out through the outlet ports D D; whichoccasions banging or water hammer. WVhen the rotor is handling water, itwilLbe seen that the sameacts substantially like a centrifugal waterpump, theinlet ports C 0 representing the inlets or eye, connecting tothe impeller, and

thewatcr being thrown outwardly in the impeller and clearingtherefrombeyond the periphery thereof into the outlets G G.

The pump will act to maintain a substantially constant vacuum orsuction, as the pressure of the water pistons entering into thedisplacement chambers of the rotor is substantially determined byhydrostatic head in the pipe I.

Thus, both gas and liquid-can be handled efficiently by one rotor and ifdesired, the apparatus can be designed to work without the separatingtank usually employed. in systems of the character referred to.

' In the same manner the pump can be used in paper mill work.

In some instances only one water outlet or port can be used in the pumpcasing. This arrangement is illustrated. in Figure 5 of the drawings.'-This arrangement can be 1 used where the volume of liquid is smallrelativelyto the volume of air or gas which is to be handled or wherethe pump casing has only one eccentric section.

The apparatus, can. be used as a sump pump, in'which thepumpingapparatus placed, above the sump. When put in this location and startedin operation,-the pump will first act to exhaust air from the pipeleading up from the sump. This will lift the water u'pto thepump whichwill thereafter act as a centrifugal pump, lifting and pumping the waterfrom the-sump. In effeet, then the pum will act'as a self-starting,lifting, and orcing centrifugal water P P- The details and arrangementsherein shown and described may be greatly varied by askilled mechanicwithout departing from the scope of my invention as expressed in theclaims.

Having thus fully described my inven- 4 tion, what I claim and desire tosecure by Letters Patent is 1. In a pump, employing liquid as thepumping medium a rotor having displace ment chambers, a casing arrangedeccentrically to the rotor, .a gas inlet and outlet, and a liquid outletor port arranged at a point in the casing where the operating liquidtendsto exert a compression effect.

2. In a pump, employing liquid as the pumping medium, a rotor havingdisplacement chambers, a casing arranged eccentrically to the rotor, agas inlet and outlet, and a liquid outlet or port arranged at a pointinthe casing where the operating liquid tends to exert its maximumcompression effect.

3. In a pump employing a liquid as the pumping medium, a rotor havingdisplacement chambers, a casing having a plurality of section arrangede'ccentrically to the rotor, gas inlet and outlet ports, and liquidoutlets or ports arranged at points in the casing where the operatingliquid tends to exert a compression effect.

4. In a pump employing a liquid as the pumping medium, a ro or havingdisplacement chambers,- a casing arranged eccentrically to the rotor,agas inlet and outlet, 2.

liquid outlet or port arranged at a point in the casing where theoperating liquid tends to exert a compression effect, and an outlet pipeconnected to the liquid outlet or port and carried up for a considerableheight so as to give a hydrostatic head back into the pump casing,whereby the pump is arranged to handle both gases and liquids.

5. In 'a pump employing a liquid, as the pumping .medium, a rotor havingdisplacement chambers, a casing having two sections arrangedeccentrically to the rotor, gas inlet head back into the pump casingwhereby the I pump is arranged to handle both gases and liquids. u

6. In a pump employing a liquid as a pumping medium, a rotor havingdisplacement chambers, a casing arranged eccentrically to, the rotor, agas inlet and outlet, a

liquid outlet or port'arranged at a point in the casing where theoperating liquid tends to exert a compression effect, an outlet pipeconnected to the l'iquid outlet or port and carried up to a considerableheight so.

as to providea hydrostatic head back into the casing, and a header intowhich the outlet pipe connects.

In testimony whereof I have hereunto af fixed my signature.

IRVING C. JENNINGS.

